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The effects of BCGs on the statistics of large-separation lensed quasars by clusters
Qi, Hong; Chen, Da-Ming
2011-09-01
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
卷号11期号:9页码:1003-1018
摘要We study the statistics of large-separation multiply-imaged quasars lensed by clusters of galaxies. In particular, we examine how the observed brightest cluster galaxies (BCGs) affect the predicted numbers of wide-separation lenses. We model the lens as an NFW-profiled dark matter halo with a truncated singular isothermal sphere to represent the BCG in its center. We mainly make predictions for the Sloan Digital Sky Survey Quasar Lens Search (SQLS) sample from the Data Release 5 (DR5) in two standard ACDM cosmological models: a model with matter density Omega(M) = 0.3 and sigma(8) = 0.9, as is usually adopted in the literature (ACDM1), and a model suggested by the WMAP seven-year (WMAP7) data with Omega(M) = 0.266 and sigma(8) = 0.801. We also study the lensing properties for the WMAP3 cosmology in order to compare with the previous work. We find that BCGs in the centers of clusters significantly enhance the lensing efficiency by a factor of 2 3 compared with that of NFW-profiled pure dark matter halos. In addition, the dependence of mass ratios of BCGs to their host halos on the host halo masses reduces the lensing rate by similar to 20% from assuming a constant ratio as in previous studies, but considering the evolution of this ratio with redshift out to z similar to 1 would reduce it by similar to 3%. Moreover, we predict that the numbers of lensed quasars with image separations larger than 10 '' in the statistical sample of SQLS from DR5 are 1.22 and 0.47, respectively for Lambda CDM1 and WMAP7 and 0.73 and 0.33 for separations between 10 '' and 20 '', which are consistent with the only observed cluster lens with such a large separation in the complete SQLS sample.
关键词Cosmological Parameters Cosmology: Theory Galaxies: Clusters Gravitational Lensing Dark Matter
收录类别SCI
语种英语
WOS记录号WOS:000295116100001
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8085
专题星系宇宙学研究部
作者单位Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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Qi, Hong,Chen, Da-Ming. The effects of BCGs on the statistics of large-separation lensed quasars by clusters[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(9):1003-1018.
APA Qi, Hong,&Chen, Da-Ming.(2011).The effects of BCGs on the statistics of large-separation lensed quasars by clusters.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(9),1003-1018.
MLA Qi, Hong,et al."The effects of BCGs on the statistics of large-separation lensed quasars by clusters".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.9(2011):1003-1018.
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